const a = ['a', 'b', 'c'];
// ⭐️ keys are "integers"
Array.from(a.entries()), // [ [ 0, 'a' ], [ 1, 'b' ], [ 2, 'c' ] ]
// ⭐️ keys are "strings"
Object.entries(a), // [ [ '0', 'a' ], [ '1', 'b' ], [ '2', 'c' ] ]
for(const [i, value] of Object.entries(a)) {
console.log(i + 1); // 🧨 雷區:'01', '11', '21' ❗❗❗
}